Glare eliminator



R, E. EAvEs T Al..

Y GLARE ELIMINATOR lnvenTors. y Ralph'Ecives K William C.Keen

byMy

Patented May 31, 1927.

' UNITED STATES 'PATENT OFFICE.

RALPH E. EAVES AND WILLIAM C. KEEN, 0F ALLSTON, MASSACHUSETTS.

GLARE ELIMINATOR.

Application tiled March 1, 1926. Serial No. 91,437.

This invention relates to glare screens which are designed for use in connection with automobiles for the purpose of shielding the drivers eyes from the glare of the headlights of an approaching automobile.

The invention relates to that class of glare screens which comprise an intermittent light interrupter which is'situated in the line of vision of the driver of the autom'obile and which by its operations intermittently cuts off the light from the lamp of the approaching car thus reducing the amount of light which reaches the drivers eyes without interfering appreciably with his vision.

One of the objects of the invention is to provide a novel glare screen of the above type which when in operation will perform its functions of reducing the amount of light from the headlights of an approaching car which reaches the driver and lwhich when not in use will give driver a substan* tially free and unobstructed vision of the road ahead. To this end the device embodying the invention comprises one -or more blades, each of which is arranged to rotate about an axis extending substantially at right angles to the line of vision of the driver together with means for rotating the blade or blades rapidly, the construction being such that when the rotating means is inoperative and the blade or blades are at rest each blade will stand with its edge presented to the driver thus leaving the driver a free and unobstructed view. y

@ther objects of the invention are to provide various improvements in glare screens o f this ty e all as will be more fully hereinafter set orth.

In order to give an understanding of the invention we have illustrated in the drawings a selected embodiment thereof which will now be described after which the novel features will be pointed out in the appended claims.

Fig. l illustrates a portion of the windshield of an automobile having the iinproved glare screen attached thereto;

Fig. 2 is a section on the line 2 2, Fig. l;

Fig. 3 is an under side view of one end of the device;

Fig. 4 is an end view; y

Fi 5 is a view similar to Fig. 2 but showing the blades in position to cut ofi' the f drivers vision of the road ahead.

In the drawings 1 indicates the portion of road directly ahead.

the windshield of an automobile throu h which the driver looks when operating t e car, 2 being a portion of the windshield post. As stated above our improved glare screen comprises one or more. light-interrupting blades, each of which is mounted to rotate about an axis at right angles to the line of vision of the driver. Any number of blades may be employed in any glare screen without departing from. the invention. The illustrated embodiment of the invention contains two blades, indicated at 3 and 4 respectively. These blades are supported in a frame 5 which is so supported that the blades 3 and 4 are in the line of vision of the driver. Each of the blades is herein shown as a long and relatively narraw lstripv of metal. The blade 3 is mounted upon a shaft 6 which extends longitudinally thereof and preferably along the median line thereof, one end of the shaft being journalled in the end 7 of the frameand the other end of the shaft being journalled in a bearing block 8 carried by the frame. The blade 4 is similarly mounted on a shaft 9 which extends longitudinally of the frame, one end being journalled in the end of the frame and the other end being journalled in the bearing block 8. y

Means are provided for rotating the shafts rapidly and as they are rotated each blade will be Aturned from a position in which it occupies a vertical plane atright angles to the line of vision and thus presents its side face to the driver, to a position in a horizontal plane in which it is parallel to the line of vision so that the driver sees it in edge-view, and vice versa.4 l/Vhen the blade or blades are rotating, therefore, each blade will act to intermittently cut oi the light from the head lamps of an approaching car but as the blades are rotating ra idly they will merely cut down the lig t` which reaches the drivers eyes without materially interfering with his visionl of the -"Where more than one blade is used 'the blades will preferably be rotated in unison and in timed relation with each other. In the case of a. deviceeinploying two blades 3 and 4 these bladesl may be connected by intermeshing gears l0 and 11 of the same size which are fast on the shafts 6 and 9 so that the two blades rotate at the same speed.

While any appropriate means forl rotating ice ' -herein an electric motor indicated generally bracket is shown as an "ajat 12 and the armature of which is fast on the shaft 3. This motor is supplied with current from any suitable source, such for instance the automobile battery, not shown, the circuit wires 13 being'illustrated as connected to the two terminals 14 and 15.

16 -indicates a switch in the circuit by which the operation of the motor` is controlled. The switch may be of any approved type and is herein shown as comprisinga switch arm 17 'operated by a thumb piece 18 and adapted to be closed onto a contact 19 in the motor circuit. The motor is shown as mounted in 'an extension 20'of the lframe 5 and the switch may be conveniently placed beneath said extension where it is within easy reach of the driver.

The blades 3 and l will preferably have such a size and are so positioned relative to each other that as they rotate they come into a vertical plane substantiallysimultaneously and then each moves into a horizontal plane at the same time. Furthermore, the width of the blades is such that when they are in the vertical plane, as shown in Fig. 5, they obstruct entirely the drivers vis'ion through the frame while when they are in their horizontal position, as shown in Fig2, they present practically no obstruction to the line of vision and at t `is time the driver has practically unimpaire vision of the roadway ahead Since in the. operation of the device the driver has alternately and in'rapid succession unimpaired vision of the road ahead and thengcomplete obscurity of vision the result will be in effect that the device cuts down or reduces the light reaching the drivers eye from an approaching automobile by more than one-half whichis sufficient to eliminate entirely the disagreeable effect of the glaring rays of the headlight of such an approaching automobile The device may be supported in positionV in any a(pproved way without departing from the invention. In the construction herein shown the frame 5 is secured to a bracket 21 which is clamped to the top rail 22 of the windshield, this bein a construction which might b'e employe in an open automobile. The upper end of the bracket is shown as having'a hook portion 23 which i. hooks over the' upper rail 22 of the windshield, said bracket being `held in position on the rail by clampin crews 24. The le iron bracket and it --has two ears 25 extending therefrom which are clamped to other ears 26 extending from the frame. The brae'ketis made so that it can beadjusted into different angular positions and' for 'tl'iisypurpose the angle iron member 21 is pivetei to the hook "this deviceis that it does not effect the color I member 123, as shown at 27,' so that the angle iron member` and frame can be swung toward and from the windshield. The motor is held `in adjusted position by a clamping screw 28 which extends through a slot 29 in one leg of the angle iron member and screws into a foot portion 30 depending from the hook member.

The supporting ears 25 are vertically adjustable on the bracket 21 so as to provide for adjusting the position of the glare screen in a vertical direction. For this purpose one leg of the angle iron member 21 is provided with a slot 31 which extends longitudinally thereof, and which receives clamping screws 32 by which the ears are clamped to the bracket.

In order that said glare screen or glare eliminator may not present any material obstruction to the drivers vision when it is not spring 34, the other end of the spring being fastened to a fixe/d point, as for instance the projection 35 extending from the frame. The tendency of the spring will be to pull the crank pin 33 to its highest point. This crank pin is situated at 90 from the blade so that when the crank pin is brought into its highest point at its upper dead center, as shown in Figs. 1 and 4, the blade 3 will bel in a horizontal position. Therefore, whenever the switch is opened to stop the motor 12 the blades will come to rest in the position shown in Fig. 2, in which position they present the minimum obstruction to the ydrivers vision.

Whileit would be within the invention to mountthe frame so thatyjt could be swung out ofv way if desired" yet with this ccn-V vby which the blades when brought to restare automatically stopped in their horizontal position, it is not necessary to swing the frame out'of the way when the glare screen is not desired as the blades in their horizontal position present practically 1 of any object seen through the device, as a' colored screen would do, nor does it effect in any way the drivers perceptionjof distance. Any object seen through the device when the blades are operating will appear lthe same as when not seen 4through the device except that the li ht will 'be reduced but the color of the ob]ectA does not appear to bechanged nor does the distance of the object of the ldriver appear any different when seen through said device than when tion of light or through seen without the glare eliminator interposed in the line of vision.

The device herein shownhas the further advantage that it lgives 'a varied reduction of light at different points in the line of vision.: Along the line of thej axis of rotation of ea'ch blade the reduction in light .will be greatest and in the space between the two axial lines of rotation the. reduction in light will decrease progressively from /said lines toward the center ofl said space. The

amount whichthe light is reduced at any point depends` upon the proportion ofthe i entirel time in which the blade cuts -oi 'the view of the driver as compared withthe. portionA of time in which the view is not interfered with. Along a line closely adjacent the axis the vision of the driverv will be cut off 'for a greater portion of the time than alon a' line-adjacent where the outer edge of t e blade travels in its rotation, this being the result of a donstruction in'which the blades rotateabout an axis perpendicular to the line of vision.

With the two blades, therefore, as shown herein there will be two parallel' lines'along the axes of rotation-where the-reduction of light will be greatest and in the space between the two axes the reduction of light decreases progressively from the axis to the center at the points vwhere theblades -overlap. Hence when the device is-in use the' driver can, by shifting his head slightl up ordown, lookat an object in front o the automobile throughthe portion of the anti-A glare device .which gives the greatest reducthe'portion which gives the least reduction.

When a driver'ismeetin an automobile with very bright headli lits ecan shift his eyes sothat'the lineo `vision between his eyes and the' headlights will come vclosely adjacent to the axis of one of the blades thus giving a maximum `reduction of light'whil'e iflthe lights are not Avery bri ht andbetterirision. is '.desired he can .shi his' e es u or down so as to look atgthe object tiiroug the center of the space-'f between the axes.' and where the reductionA of light is least.

While we'have above` referred to our in- 'vention as a glare eliminator which rotects the eyesof the driver of an'automoi e' from glaring headlights yet lthe invention ma also'be useful as a protector in othr feldg to the line of vision of the user vision.

'as for instance in protecting a person `from foreign-'bodies inthe air. When used in this way if the device is held in front of the eyes orv face the rotating blades willl protect the face and eyes against any iiying particles in the air without impairing hisvision'.4 y 1 We claim: v

l l 1. A glare screen for automobiles comprising a blade rotatable about an axis extendi'ng at substantially right angles tothe lineof vision ofthe driver of the automobile,'f

and means to rotate, said blade continuopsly and rapidly, whereby the amount of light which passes through the rotating 'blade to the drivers eyeincreases progressively from the axial line of rotation outwardly.I

2. A glare screen or 4protector comprising a pluralityof blades each rotatable fabout 4: A'glare screen for automobiles compris- .ing a; plurality of rotatable blades. havingl parallel axes, means for supporting said blades with' their s'axes at substantially right .f

angles to the line 'of vision of the driver of the automobile,'and means for rotating said -blades `continuously and rapidly, 'whereby the'rotating blades produce 4avaried reduction vof the light passing to the drivers eye, the greatest reduction beingalong the axis .of rotation.

5. A glare'screen for automobiles com r1s,

ing a plurality of blades rotatable `a out arall'el axes, means for supporting said driver .of the automobile, and means to rotate said blades continuously in unison,the axes of the blades being so spaced that when the blades are in a laneat right anglesto the line of vi on t ey completely obscuresaid 6. A .glare screenfor automobiles com rislades so that their axes are substantiallyat right-angles t thef line of vision of the ing aiplurality 4of blades rotatable a out parallell axes extending* at 'substantially right angles to the line of `vision' of the driven of the'automobjle, means operative. when the blade-rotatingl means'- ceases to operate to bring the blades. to rest. in planes substan-y tially parallelto the line of vision, whereby when at'rest they do not appreciably impair the Avision'of the driver.-

-In testimony whereof, we have signed our 

